Los Angeles Mayor Eric Garcetti signed an ordinance on Friday that bans the ownership of firearms magazines that carry more than 10 rounds. The new law, which was first introduced by City Councilman Paul Krekorian and passed Los Angeles’ City Council unanimously on July 28, is set to take effect in early September, and individuals found in violation of it will be charged with a misdemeanor.

According to Los Cerritos News, a 15-year-old statewide ban prohibits the sale, purchase, or importation of magazines with more than ten rounds, but a grandfather clause in the law allows gun owners to keep the magazines they owned prior to its passage. The City of Los Angeles’ new ordinance effectively repeals that grandfather clause within the city.

Guns.com’s Chris Eger, who called the magazine ban “confiscatory,” wrote, “People who currently possess such magazines, many for collectible firearms registered decades ago, have a 60 day window to remove them from the city, sell them to a legal gun dealer, or turn them in to the Los Angeles Police Department.” The ordinance exempts law enforcement officers, museums, movie prop masters, gunsmiths, and magazines that belong to legal collectibles for which smaller clips are not manufactured.

“I am committed to reducing the gun violence in our city,” read a statement by Mayor Eric Garcetti. “This ban is part of that larger effort. It will help keep our streets safer and help prevent the magnitude of mass shootings. We are sending a clear message – we will not wait for Washington to act, we are ready to act now.”

Courthouse News Service notes that City Councilman Paul Krekorian said of the new law, “Los Angeles is now the largest city in California to ban the possession of large-capacity magazines. These magazines may not be the cause of gun violence, but when shooters use them, tragedies turn into massacres.”

A National Rifle Association statement on the new rule read, “This ordinance will not prevent violent crime or mass shootings, but it does limit the Second Amendment rights of law-abiding gun owners who choose these magazines to defend themselves and their families. As most gun owners already know, magazines holding more than ten rounds are standard equipment for many popular pistols and rifles, especially those that are selected for defensive purposes. These standard capacity magazines are possessed by millions of law-abiding Americans for a variety of lawful purposes, including self-defense.”

Gun rights groups are planning to file a lawsuit against the ordinance. The National Rifle Association has in the past attempted to mount unsuccessful legal challenges against similar rules in Sunnyvale and San Francisco, Calif.

Barry Donegan is a writer, musician, and pro-liberty political activist living in Nashville, TN. Donegan served as Director-at-Large of the Davidson County Republican Party from 2009-2011 and was the Middle Tennessee Regional Coordinator over 30 counties for Ron Paul's 2012 Presidential Campaign. Follow him at facebook.com/barry.donegan and twitter.com/barrydonegan